Roorkee express normally reaches its destination at 50 km/h in 30 hours. Find the speed at which it travels to reduce the time by 10 hours?
  • 138 km/h
  • 276 km/h
  • 375 km/h
  • 460 km/h
Answer:- 1
Explanation:-

Solution:
let required speed be S km/h.
50*30 = S*20
S = 75 km/h.

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